How to use LUTs?
LUTs have been added to the VFB so that you can load .cube and .3dl LUT files to apply to your renders. The CoronaOutput map now also supports LUT processing, which can be used to apply LUTs to a bitmap or procedural map for use in your materials.
What is it?
LUT (Look-Up Table) files are widely used for image processing. They change the color of each pixel based on its original value, thus creating an effect of color grading and contrast change.
See: Lookup Table on Wikipedia
One render with three different LUTs applied
Where to find it?
In Corona, all post processing options, including LUTs, can be adjusted in real time during and after rendering. This applies to both regular and interactive rendering.
LUT controls can be found in:
The Corona VFB
"Post" tab > Tone Mapping > LUT opacity
This enables/disables the LUT effect, and also allows to change its opacity (intensity).
LUT settings in the Corona VFB
Render Setup > Camera > Postprocessing > LUT
This allows: enabling/disabling the LUT effect, changing the folder from which the LUT files are loaded, manually choosing the specific LUT file, changing its opacity (intensity)
There is also a "Input LUT is in Log color space" checkbox, which should be enabled only in case the LUT effect is displayed incorrectly for the currently chosen file.
LUT settings in the Render Setup window
Are there some LUTs bundled with Corona?
Corona Renderer 1.6 comes with more than 80 LUTs bundled in the installer – we’d like to thank Adan Martin for providing his LUTs, Ground Control for designing 10 LUTs specially for Corona, Kim Amland (also known as Dubcat) for creating photographic LUTs, and Martin Nabelek for providing the LUTs he used in the making of award-winning short film OFF.
To enable the default LUTs, simply activate the LUT option in Corona VFB or in Render Setup > Camera > Postprocessing > LUT.
The pre-installed LUT files can be found in C:\Program Files\Corona\lut .
LUTs and Corona Output map
The CoronaOutput map also supports LUT processing, which lets you apply LUTs to bitmaps, procedural maps, etc for use in your materials.
LUT processing can be enabled in the CoronaOutput map